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| Dynamic structure analysis is offered as a supplement to the FEM static module. Existing projects can be analyzed based on a dynamic calculation that takes all types of elements into consideration. The results can be combined with the reactions of the static calculations for design or the stress results.
As it supports the evaluation of response spectra according to DIN 4149 (1981, 1992 and 2005) ÖNORM B 4015 and SIA 161, the program is suitable for checks of structures in earthquake-prone areas or for the analysis of machine foundations, for instance.
The earthquake checks are complemented by the option of defining customized response spectra and superposing and analyzing them according to CQC or SRRS methods. |
Deformation of the superposed response spectra
(example from
BKSi GmbH, Stuttgart – formerly IFB Dr. Braschel AG) |
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The dynamic stress resulting from a train crossing can be easily analyzed with predefined trains like, for instance, ICE, Thalys etc. or user-defined train loads. All the user needs to do is define the track in the system and select the desired train(s).
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All results can be animated graphically or plotted against time elapsed. |
Eigenmode of a machine foundation with point masses |
Graphical representation of a time-dependent node displacement
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Features of the 'FEM Dynamik' Module |
- calculation of beam, cable, area and solid models
- determination of eigenvalues and eigenvectors
- distributed dead loads, point masses and masses from loads
- periodic and free load-time curves
- simultaneous variable exciters at any node
- free node accelerations
- Lehr's damping, mass and stiffness-proportional damping,
Rayleigh's system damping and single viscous dampers
- modal analyses and direct integration of motion equations
- time-step integration for all system reactions with
selectable iteration steps
- stationary response
- evaluation of response spectra according to EC8, DIN 4149,
OENORM B 4015 and SIA 261
- user-defined response spectra
- calculation and output of effective modal masses
- dynamic train crossing on any track
- animation of all time-step calculations
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